Features of Opera include tabbed browsing, page zooming, mouse gestures, and an integrated download manager. Its security features include built-in phishing and malware protection, strong encryption when browsing secure web sites, and the ability to easily delete private data such as HTTP cookies.
First download latest Opera .deb package from here
Once you downloaded the .deb file install this file using the following command
sudo dpkg -i opera_10.00.4585.gcc4.qt3_i386.deb
Install flash plugin using the following command
sudo apt-get install flashplugin-nonfree
If you have problem with your videos follow this procedure
Click on Tools > Preferences >go To The advanced tab
Click on Downloads on the left side
find the one that says application/x-shockwave-flash
Click Edit at the bottom it says Use Plugin from the pull down menu
select the one that says: ‘Shockwave Flash -- /usr/lib/mozilla/plugins/flashplugin-alternative.
so' if it doesn't work you can try a different one from the pull down menu
Click OK and exit
Install Java plugins using the following command
sudo apt-get install sun-java6-fonts sun-java6-jre sun-java6-plugin ubuntu-restricted-extras